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Definition of imperative : 1. Expressive of command; containing positive command; authoritatively or absolutely directive; commanding; authoritative; as, imperative orders.
2. Expressive of commund, entreaty, advice, or exhortation; as, the imperative mood.
3. Not to be avoided or evaded; obligatory; binding; compulsory; as, an imperative duty or order.
4. The imperative mood; also, a verb in the imperative mood.

Synonyms:

imperative form, coercive, unequivocal, urgent, crying, dictatorial, need, overbearing, autocratic, absolute, arbitrary, burden, positive, imperative mood, irresponsible, exacting, supreme, tyrannical, duty, authoritative, despotic, adjuratory, jussive mood, exigent, dogmatic, emergent, dire, lordly, charge, immediate, responsibility, haughty, clamant, crucial, domineering, desperate, commitment, compulsive, burning, insistent, commanding, unconditional, arrogant, instant, big, imperious, important, controlling, peremptory

masterful, dominant, powerful

prerequisite, involuntary, proviso, stipulated, inexorable, must, inescapable, essential

inevitability, necessity, compulsion, stipulation, mandate, constraint, condition, requirement, inexorability, obligation

indispensable, compulsory, required, mandatory, pressing, necessary, constraining, obligatory, inevitable, binding, requisite

Usage examples:

• But they are the debts of honour, imperative. - "The Complete Project Gutenberg Works of George Meredith", George Meredith.
• He could not explain the nature of it, but a man of honor would feel it imperative. - "Foes", Mary Johnston.
• The loss of his cattle made it more imperative that Don Mariano should look closely into land matters, into the prospects of a railroad for San Diego. - "The Squatter and the Don", C. Loyal.